The tyrosine kinase inhibitor sorafenib sensitizes hepatocellular carcinoma cells to taxol by suppressing the HURP protein
| Autor: | Hsing-Pang Lu, Tzu-Ching Kuo, Chuck C.-K. Chao |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Sorafenib
Niacinamide Carcinoma Hepatocellular Paclitaxel medicine.drug_class Leupeptins Pyridines Apoptosis Biology Biochemistry Tyrosine-kinase inhibitor Small hairpin RNA Downregulation and upregulation Cell Line Tumor medicine Humans Transcription factor Protein Kinase Inhibitors Pharmacology Gene knockdown Oncogene Phenylurea Compounds EIF4E Benzenesulfonates Liver Neoplasms NF-kappa B digestive system diseases Proto-Oncogene Proteins c-rel Neoplasm Proteins Eukaryotic Initiation Factor-4E Cancer research medicine.drug |
| Zdroj: | Biochemical pharmacology. 82(2) |
| ISSN: | 1873-2968 |
| Popis: | The hepatoma upregulated protein (HURP) represents a putative oncogene that is overexpressed in many human cancers, especially hepatocellular carcinoma (HCC). HURP plays an important role during mitotic spindle formation, a process that is targeted by various anti-cancer drugs like taxol. However, the role of HURP during the establishment of taxol chemoresistance in HCC remains unclear. In this study, we observed that high HURP protein level correlates with taxol resistance in HCC cells. Following HURP knockdown, HCC cells show a more sensitive response to taxol treatment. Notably, sorafenib, a tyrosine kinase inhibitor approved for the treatment of HCC, inhibits HURP expression primarily at the transcriptional level and sensitizes HCC cells to sub-lethal doses of taxol. By using real-time PCR and chromatin immunoprecipitation assays, we observed that the NF-κB family member c-Rel represents a putative transcription factor that activates HURP gene expression. In addition, the inhibitory effect of sorafenib on HURP expression was attributed to a reduced translation and nuclear translocation of c-Rel. Accordingly, downregulation of c-Rel using short-hairpin RNA was shown to reduce HURP protein level and enhance taxol-induced cell death. Taken together, our results indicate that HURP acts as a novel survival protein that protects HCC cells against taxol-induced cell death. In addition, the regulation of HURP gene expression by NF-κB signaling appears to be critical for the response of HCC cells to taxol. |
| Databáze: | OpenAIRE |
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